* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
}

html, body { width: 100%; height: 100%; overflow: hidden; }

body {
  font-family: var(--font-body);
  background-color: #3d2b1f;
  background-image: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 10px,
    rgba(255, 255, 255, 0.14) 10px,
    rgba(255, 255, 255, 0.14) 13px
  );
}

#viewport {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

#desk {
  position: absolute;
  top: 0;
  left: 0;
  will-change: transform;
}

.mat {
  position: absolute;
  left: calc(var(--x) * 100vw);
  top: calc(var(--y) * 100vh);
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.mat[data-mat="home"]     { background: #0d4a2a; --line-tint: rgba(140,220,170,0.55); --line-tint-strong: #8cdcaa; }
.mat[data-mat="projects"] { background: #202f4d; --line-tint: rgba(154,182,232,0.5); --line-tint-strong: #9ab6e8; }
.mat[data-mat="contact"]  { background: #0a0a0a; --line-tint: rgba(255,255,255,0.22); --line-tint-strong: #ffffff; }

.cutting-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.cutting-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.mat-accessory {
  position: absolute;
  z-index: 3;
  display: block;
  height: auto;
  pointer-events: none;
  user-select: none;
  filter: drop-shadow(3px 6px 4px rgba(0, 0, 0, 0.35));
}

#nav {
  position: fixed;
  top: 52px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 16px;
  border: 1px solid var(--nav-border, rgba(255, 255, 255, 0.35));
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(2px);
  transition: opacity 0.2s ease;
}

#nav.is-panning {
  opacity: 0;
  pointer-events: none;
}

.nav-link {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  padding-bottom: 3px;
  border-bottom: 1.5px solid transparent;
}

.nav-link.cur {
  color: #fff;
  border-bottom-color: var(--nav-accent, #fff);
}

.nav-sep {
  font-family: var(--font-body);
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.25);
  user-select: none;
}

/* ── Scrollbar base ── */
.styled-scroll,
.project-sheet,
.info-card-body,
.contact-screen {
  scrollbar-width: thin;
}

.styled-scroll::-webkit-scrollbar,
.project-sheet::-webkit-scrollbar,
.info-card-body::-webkit-scrollbar,
.contact-screen::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.styled-scroll::-webkit-scrollbar-track,
.project-sheet::-webkit-scrollbar-track,
.info-card-body::-webkit-scrollbar-track,
.contact-screen::-webkit-scrollbar-track {
  background: transparent;
}

.styled-scroll::-webkit-scrollbar-thumb,
.project-sheet::-webkit-scrollbar-thumb,
.info-card-body::-webkit-scrollbar-thumb,
.contact-screen::-webkit-scrollbar-thumb {
  border-radius: 3px;
}

[data-animate="fade-up"] {
  opacity: 0;
  transform: translateY(8px);
}

.draw-line {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}

@media (max-width: 720px) {
  :root {
    --mobile-nav-bottom: max(16px, env(safe-area-inset-bottom));
  }

  .mat {
    top: calc(var(--y) * 100dvh);
    height: 100dvh;
  }

  #nav {
    top: auto;
    bottom: var(--mobile-nav-bottom);
    align-items: center;
    max-width: calc(100% - 32px);
    padding: 6px 8px;
    border-radius: 28px;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  }

  .nav-link {
    min-height: 44px;
    padding: 10px 16px;
    font-size: 12.5px;
    letter-spacing: 0.1em;
    border-bottom: none;
    border-radius: 20px;
    transition: background 0.2s ease, color 0.2s ease;
  }

  .nav-link.cur {
    background: rgba(255, 255, 255, 0.15);
    border-bottom-color: transparent;
  }

  .nav-sep {
    display: none;
  }

  .mat-accessory {
    display: none;
  }
}

@media (min-width: 721px) and (max-height: 480px) {
  #nav {
    top: 6px;
    padding: 4px 12px;
  }

  .nav-link {
    padding: 10px 6px 8px;
    font-size: 11px;
  }
}

@media (max-height: 480px) {
  .mat-accessory {
    display: none;
  }

  .nav-link {
    min-height: 44px;
  }
}